Pattern series
Access Control Filtering (ACL)
5 System Design questions share this exact tag. Use the closely related series below for a fuller drill.
- 01Preview
Facebook Post Search
Design search over a social feed — let users find posts by keyword in near real time while respecting each post’s privacy/visibility settings.
Meta - 02Preview
Google Drive
Design Google Drive as a permissioned file platform — folder hierarchies, shared drives, and access control that scale across billions of files and th...
Google - 03Preview
RAG Knowledge Assistant
Design an enterprise RAG knowledge assistant that answers employee questions over internal documents (wikis, tickets, contracts) with grounded, cited...
OpenAI - 04Preview
MCP Tool Gateway
Design an MCP-style tool gateway that lets AI agents discover and invoke enterprise tools (CRM writes, ticketing, internal APIs) safely, with per-user...
Anthropic - 05Free guide